$A$ number increased by $22 \frac{1}{2} \%$ gives $98$. The number is

If the price of a book is first decreased by $25 \%$ and then increased by $20 \%,$ then the net change in the price will be

In an office,$40 \%$ of the staff is female,$70 \%$ of the female staff and $50 \%$ of the male staff are married. The percentage of the unmarried staff in the office is

What percentage of numbers from $1$ to $70$ have squares that end in the digit $1$?

In the laptop market,only three competitors (Lenovo,Apple,and Samsung) exist. Last year,the sales of Apple laptops were $10 \%$ more than Lenovo. This year,both the firms Lenovo and Apple increased their respective sales by $20 \%$. This year,the sales of the firm Apple are five times that of Samsung. What percentage of the total market sales did Samsung account for last year,if the total sales remained constant over the two-year period (in $\%$)?

The salary of a person was reduced by $10 \%$. By what percent should his reduced salary be raised so as to bring it at par with his original salary (in $\%$)?